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Consolidated Statements of Stockholders' Equity - USD ($)
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2020 39,747,659 (12,253,502)      
Balance at Dec. 31, 2020 $ 39,748 $ (18,929,915) $ 98,013,079 $ (50,676,351) $ 28,446,561
Stock-based compensation expenses $ 0 $ 0 1,784,102 0 $ 1,784,102
Issuance of common stock upon exercise of stock options (in shares) 735,000 0     735,000
Issuance of common stock upon exercise of stock options $ 735 $ 0 1,229,315 0 $ 1,230,050
Net loss $ 0 $ 0 0 (13,070,251) (13,070,251)
Balance (in shares) at Dec. 31, 2021 40,482,659 (12,253,502)      
Balance at Dec. 31, 2021 $ 40,483 $ (18,929,915) 101,026,496 (63,746,602) 18,390,462
Stock-based compensation expenses $ 0 $ 0 1,888,944 0 $ 1,888,944
Issuance of common stock upon exercise of stock options (in shares) 333,943 0     333,943 [1]
Issuance of common stock upon exercise of stock options $ 334 $ 0 543,257 0 $ 543,591
Net loss $ 0 $ 0 0 (9,735,258) (9,735,258)
Balance (in shares) at Dec. 31, 2022 40,816,602 (12,253,502)      
Balance at Dec. 31, 2022 $ 40,817 $ (18,929,915) $ 103,458,697 $ (73,481,860) $ 11,087,739
[1] Represents the following stock options exercised: • 150,000 stock options exercised at $1.87, 40,000 stock options exercised at $1.63, 8,943 stock options exercised at $1.57, and 50,000 stock options exercised at $1.44, 50,000 stock options exercised at $1.39, and 35,000 stock options exercised at $1.21.